foreach (['s16', 's32', 's64', 's128', 's256'] as $shard) {
            if (isset($context[$shard])) {
                $params['ExpressionAttributeNames']["#{$shard}"] = $shard;
                $params['ExpressionAttributeValues'][":v_{$shard}"] = ['N' => (string)((int)$context[$shard])];
                $filterExpressions[] = "#{$shard} = :v_{$shard}";